<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc, index) in starClasss" :class="sc" :key="index">
        </span>
        
    </div>
</template>

<script>
//类名常量
const CLASS_ON = 'on'
const CLASS_HALF = 'half'
const CLASS_0FF = 'off'
export default {
    props: {
         score: Number,
         size: Number
    },
    computed: {
        starClasss () {
            const {score} = this
            const scs = []
            //向scs中添加n个CLASS_ON
            const scoreInteger = Math.floor(score)
            for (let i = 0; i < scoreInteger; i++) {
                scs.push(CLASS_ON)
            }
            //向scs中添加0/1个CLASS_HALF
            if (score*10 - scoreInteger*10 >= 5) {
                scs.push(CLASS_HALF)
            }
            //向scs中添加n个CLASS_0FF
            while(scs.length < 5) {
                scs.push(CLASS_0FF)
            }
            return scs
        }
    }
}
</script>

<style lang="stylus" scoped>
@import "../../common/stylus/mixins.styl"
.star //2x图 3x图
     float left
     font-size 0
     .star-item
       display inline-block
       background-repeat no-repeat
     &.star-48
       .star-item
         width 20px
         height 20px
         margin-right 22px
         background-size 20px 20px
         &:last-child
           margin-right: 0
         &.on
           bg-image('./images/star48_on')
         &.half
           bg-image('./images/star48_half')
         &.off
           bg-image('./images/star48_off')
     &.star-36
       .star-item
         width 15px
         height 15px
         margin-right 6px
         background-size 15px 15px
         &:last-child
           margin-right 0
         &.on
           bg-image('./images/star36_on')
         &.half
           bg-image('./images/star36_half')
         &.off
           bg-image('./images/star36_off')
     &.star-24
       .star-item
         width 10px
         height 10px
         margin-right 3px
         background-size 10px 10px
         &:last-child
           margin-right 0
         &.on
           bg-image('./images/star24_on')
         &.half
           bg-image('./images/star24_half')
         &.off
           bg-image('./images/star24_off')
</style>
